It really help me do my homework :-)
if you want to know the integrate x^2 by x from 10 to 20, just type
and press return key, wolfram alpha tell you the result.
12/29/2009
I have to improve my English skill.
I can read and listen English, but can't speak or write well.
I have to improve my English to express my opinion, idea , etc.
so I'm starting to study for TOEFL test.
is there anyone who could tell me some good advice?
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